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Effect of process parameters on microstructural and mechanical properties of *** 304L explosive cladding

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Journal of Central South University 2017年第6期24卷 1245-1251页

作者： Saravanan somasundaram Raghukandan Krishnamurthy Hokamoto Kazuyuki Department of Mechanical Engineering Annamalai UniversityAnnamalai NagarTamilnadu 608002India Department of Manufacturing Engineering Annamalai UniversityAnnamalai NagarTamilnadu 608002India Institute of Pulsed Power Science Kumamoto UniversityKurokamiKumamotoJapan

The present work pertains to the study of microstructure and mechanical properties of explosively cladded commercially pure titanium(cpTi) with austenitic stainless steel(SS 304L) subjected to varied process parameters, viz., loading ratios(mass of explosive or mass of flyer plate) and preset angles. The microstructural study reveals the transformation from straight to wavy interface while increasing loading ratios. Vickers hardness increases with loading ratios, and the maximum hardness is witnessed in the closer proximity of collision interface. Ram tensile and shear strength of explosive claddings are higher than that of parent plates. While the base plate fails in impact test, the flyer plate is deformed, indicating good impact strength. Increased mass of claddings, due to oxide formation, is witnessed in corrosion tests, which confirms the superiority of explosive claddings in corrosive environment. Triaxial weldability window, an analytical estimation for Ti-SS 304L explosive claddings, is developed and correlated.

关键词： explosive cladding titanium stainless steel microstructure strength corrosion

Kautz Function Based Continuous-Time Model Predictive Controller for Load Frequency Control in a Multi-Area Power System

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Computer Modeling in Engineering & Sciences 2018年第11期117卷 169-187页

作者： A.Parassuram P.somasundaram Department of Electrical and Electronics Engineering College of EngineeringAnna UniversityGuindyChennaiTamilnaduIndia.

A continuous-time Model Predictive Controller was proposed using Kautz function in order to improve the performance of Load Frequency Control(LFC).A dynamic model of an interconnected power system was used for Model Predictive Controller(MPC)*** predicts the future trajectory of the dynamic model by calculating the optimal closed loop feedback gain *** this paper,the optimal closed loop feedback gain matrix was calculated using Kautz *** an Orthonormal Basis Function(OBF),Kautz function has an advantage of solving complex pole-based nonlinear *** Algorithm(GA)was applied to optimally tune the Kautz function-based MPC.A constraint based on phase plane analysis was implemented with the cost function in order to improve the robustness of the Kautz function-based *** proposed method was simulated with three area interconnected power system and the efficiency of the proposed method was measured and exhibited by comparing with conventional Proportional and Integral(PI)controller and Linear Quadratic Regulation(LQR).

关键词： Load frequency control model predictive controller orthonormal basis function kautz function phase plane analysis linear quadratic regulator proportional and integral controller genetic algorithm.

Modeling and Analysis of Novel Multilevel Inverter Topology with Minimum Number of Switching Components

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Computer Modeling in Engineering & Sciences 2017年第4期113卷 461-473页

作者： V.Thiyagarajan P.somasundaram Department of EEE SSN College of EngineeringKalavakkamTamilnadu603110India Department of EEE CEGAnna UniversityChennaiTamilnadu600025India

This paper proposes a novel single phase symmetrical and asymmetrical type extendable multilevel inverter topology with minimum number of *** basic circuit of the proposed inverter topology consist of four dc voltage sources and 10 main switches which synthesize 9-level output voltage during symmetrical operation and 17-level output voltage during asymmetrical *** comparison between the proposed topology with conventional and other existing inverter topologies is presented in this *** advantages of the proposed inverter topology include minimum switches,less harmonic distortion and minimum switching *** performance of the proposed multilevel inverter topology has been analyzed in both symmetrical and asymmetrical *** simulation model is developed using MATLAB/SIMULINK software to verify the performance of the proposed inverter.

关键词： Multilevel inverter symmetric asymmetric THD on state switches

Effect of Bio-filler on Hybrid Sisal-Banana-Kenaf-Flax Based Epoxy Composites:A Statistical Correlation on Flexural Strength

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Journal of Bionic Engineering 2020年第6期17卷 1263-1271页

作者： somasundaram Vivek Karuppusamy Kanthave Arun Torris Vijayananth Kavimani Department of Mechanical Engineering Anna University Regional CampusCoimbatore 641046Tamil NaduIndia Polymer Science and Engineering Division CSIR-National Chemical LaboratoryDr.Homi Bhabha RoadPune411008MaharashtraIndia Department of Mechanical Engineering Karpagam Academy of Higher EducationCoimbatore 641021Tamil NaduIndia

This work deals with the investigation of the synergistic effect of bagasse ash with sisal-banana-kenaf-flax fibers reinforced epoxy composite for their flexural *** composites with three combinations of hybrid fibers ***/kenaf(HSK),banana/kenaf(HBK),and banana/flax(HBF)with bagasse ash(BGA)as filler material are fabricated using vacuum bag assisted resin transfer *** were conducted based on L27 orthogonal array to understand the influence of control factor *** volume,alkali concentration&BGA over output response.A'-ray micro computed tomography analysis was conducted over the developed sample to infer the uniform dispersion of fiber and filler *** experimental results reveal that the addition of fiber up to 30 vol%depicts better strength and further addition results in a negative *** in order of BGA decreases the flexural strength of the developed composites.

关键词： bagasse ash natural fiber flexural strength X-ray micro computed tomography vacuum bag assisted resin transfer molding

Early Detection Glaucoma and Stargardt’s Disease Using Deep Learning Techniques

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Intelligent Automation & Soft Computing 2023年第5期36卷 1283-1299页

作者： somasundaram Devaraj Senthil Kumar Arunachalam Department of Electronics and Communication Engineering Sri Shakthi Institute of Engineering and TechnologyCoimabatore641062TamilnaduIndia

Retinal fundus images are used to discover many *** Machine learning algorithms are designed to identify the Glaucoma *** the accuracy and time consumption performance were not *** address this problem Max Pool Convolution Neural Kuan Filtered Tobit Regres-sive Segmentation based Radial Basis Image Classiﬁer(MPCNKFTRS-RBIC)Model is used for detecting the Glaucoma and Stargardt’s disease by early period using higher accuracy and minimal *** MPCNKFTRS-RBIC Model,the ret-inal fundus image is considered as an input which is preprocessed in hidden layer 1 using weighted adaptive Kuanﬁ***,preprocessed retinal fundus is given for hidden layer 2 for extracting the features like color,intensity,texture with higher *** extracting these features,the Tobit Regressive Segmenta-tion process is performed by hidden layer 3 for partitioning preprocessed image within more segments by analyzing the pixel with the extracted features of the fundus ***,the segmented image was given to output *** radial basis function analyzes the testing image region of a particular class as well as training image region with higher accuracy and minimum time *** is performed with retinal fundus image dataset with various perfor-mance metrics namely peak signal-to-noise ratio,accuracy and time,error rate concerning several retina fundus image and image size.

关键词： Glaucoma detection max pool convolution neural network kuanﬁlter radial basis function

Plant diversity and phenological pattern in the montane wet temperate forests of the southern Western Ghats,India

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Forestry Studies in China 2010年第3期12卷 116-125页

作者： Sellamuthu somasundaram Lalitha VIjAYAN Division of Conservation Ecology Salim Ali Center for Ornithology and Natural HistoryAnaikattyCoimbatore 641108Tamil NaduIndia Gujarat Institute of Desert Ecology Post Box No.83Mundra RoadBhuj-Kachchh 370001GujaratIndia

Plants diversity and phenological pattern of the trees were monitored in a montane wet temperate forest （shola） in the Kukkal Forest, Palni hills of the southern Western Ghats, India. Twelve random plots were selected for sampling the vegetation. For phenological studies, twenty-three fleshy fruit trees were identified in the study area and 10 individuals of each species were selected to record the phenological events fortnightly between April 2002 and April 2004. The phenological events were divided into vegetative and reproductive phases. A total of 2279 individuals were inventoried which belong to 83 species, 68 genera and 40 families. About 30% of the species were endemic to the Western Ghats. The most dominant species （〉 1 cm dbh） was Psychotria nilgiriensis var. astephana （Rubiaceae）, which accounted for 12% of the total sampled individuals. Lauraceae was the dominant family accounting for 20% of the individuals. Fruiting peak occurred in July 2003 and least in June 2002. During the peak period, fruits of 85 individuals of six species were observed. Syzygium tamilnadensis, Ilex wightiana and Beilschmiedia wightii fruited only once during the two years of study. The number of fruiting species showed no correlation with rainfall （r = 0.26, p = 0.2）, while a correlation was found with fruit abundance （r = 0.40, p 〈 0.05）. The results indicate that the montane wet temperate forest is unique in their diversity and a conspicuous display in phenology.

关键词： plant inventory species diversity phenology montane wet temperate forest Western Ghats India.

Improvements after mod Quad and triangle tilt revision surgical procedures in obstetric brachial plexus palsy

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World Journal of Orthopedics 2016年第11期7卷 752-757页

作者： Rahul K Nath Chandra somasundaram Texas Nerve and Paralysis Institute

AIM To compare outcomes of our revision surgical operations in obstetric brachial plexus palsy(OBPP) patients to results of conventional operative procedures at other institutions. METHODS We analyzed our OBPP data and identified 10 female and 10 male children aged 2.0 to 11.8 years(average age 6.5 years), who had prior conventional surgical therapies at other clinics. Of the 20 patients, 18 undergone triangle tilt, 2 had only mod Quad. Among 18 patients, 8 had only triangle tilt and 10 had also mod Quad as revision surgeries with us. We analyzed the anatomical improvements and functional modified Mallet statistically before and after a year post-revision *** Pre-revision surgery average modified Mallet score was 12.0 ± 1.5. This functional score was greatly improved to 18 ± 2.3(P < 0.0001) at least one-year after revision surgical procedures. Radiological scores(PHHA and glenoid version) were also improved significantly to 31.9 ± 13.6(P < 0.001),-16.3 ± 11(P < 0.0002), at least one-year after triangle tilt procedure. Their mean pretriangle tilt(yet after other surgeon's surgeries) PHHA, glenoid version and SHEAR were 14.6 ± 21.7,-31.6 ± 19.3 and 16.1 ± 14.7 *** We demonstrate here, mod Quad and triangle tilt assuccessful revision surgical procedures in 20 OBPP patients, who had other surgical treatments at other clinics before presenting to us for further treatment.

关键词： Revision surgery Obstetric brachial plexus palsy Shoulder movements Joint incongruity Upper limb

An innovative approach to minimize excess sludge production in sewage treatment using integrated bioreactors

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Journal of Environmental Sciences 2018年第5期30卷 67-77页

作者： Mahesh Mannacharaju Prabhakaran Natarajan Arivizhivendhan Kannan Villalan Madasamy Jothieswari Swarnalatha somasundaram Sekaran Ganesan Department of Environmental Science and Engineering CSIR–Central Leather Research Institute(CLRI)

The present investigation deals with an application of integrated sequential oxic and anoxic bioreactor（SOABR） and fluidized immobilized cell carbon oxidation（FICCO） reactor for the treatment of domestic wastewater with minimum sludge generation. The performance of integrated SOABR-FICCO system was evaluated on treating the domestic wastewater at hydraulic retention time（HRT） of 3 hr and 6 hr for 120 days at organic loading rate（OLR）of 191 ± 31 mg/（L·hr）. The influent wastewater was characterized by chemical oxygen demand（COD） 573 ± 93 mg/L; biochemical oxygen demand（BOD5） 197 ± 35 mg/L and total suspended solids（TSS） 450 ± 136 mg/L. The integrated SOABR-FICCO reactors have established a significant removal of COD by 94% ± 1%, BOD5 by 95% ± 0.6% and TSS by 95% ± 4% with treated domestic wastewater characteristics COD 33 ± 5 mg/L; BOD59 ± 0.8 mg/L and TSS 17 ± 9 mg/L under continuous mode of operation for 120 days. The mass of dry sludge generated from SOABR-FICCO system was 22.9 g/m3. The sludge volume index of sludge formed in the SOABR reactor was 32 mL/g and in FICCO reactor it was 46 mL/g. The sludge formed in SOABR and FICCO reactor was characterized by TGA, DSC and SEM analysis. Overall, the results demonstrated that the integrated SOABR-FICCO reactors substantially removed the pollution parameters from domestic wastewater with minimum sludge production.

关键词： Sequential oxic and anoxicbioreactor (SOABR) FICCO reactor Domestic wastewater Immobilized cell reactor

Hollow silica reinforced magnesium nanocomposites with enhanced mechanical and biological properties with computational modeling analysis for mandibular reconstruction

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International Journal of Oral Science 2020年第4期12卷 298-308页

作者： somasundaram Prasadh Vyasaraj Manakari Gururaj Parande Raymond Chung Wen Wong Manoj Gupta Faculty of Dentistry National University of Singapore9 Lower Kent Ridge RoadSingaporeSingapore Department of Mechanical Engineering National University of Singapore9 Engineering Drive 1SingaporeSingapore

The present study investigates Mg-SiO2 nanocomposites as biodegradable implants for orthopedic and maxillofacial *** effect of presence and progressive addition of hollow silica nanoparticles(0.5,1,and 1.5)vol.%on the microstructural,mechanical,degradation,and biocompatibility response of pure Mg were *** suggest that the increased addition of hollow silica nanoparticles resulted in a progressive increase in yield strength and ultimate compressive strength with Mg-1.5 vol.%SiO2 exhibiting superior *** response of Mg-SiO2 nanocomposites under the influence of Hanks’balanced salt solution revealed that the synthesized composites revealed lower corrosion rates,indicating rapid dynamic passivation when compared with pure ***,cell adhesion and proliferation of osteoblast cells were noticeably higher than pure Mg with the addition of 1 vol.%SiO2 *** biocompatibility and the in vitro biodegradation of the Mg-SiO2 nanocomposites were influenced by the SiO2 content in pure Mg with Mg-0.5 vol.%SiO2 nanocomposite exhibiting the best corrosion resistance and biocompatibility when compared with other *** in mechanical,corrosion,and biocompatibility characteristics of Mg-SiO2 nanocomposites developed in this study are also compared with properties of other metallic biomaterials used in alloplastic mandibular reconstruction in a computational model.

关键词： corrosion magnesium properties